UC2842AM PWM Controller DC-DC Regulator IC

Part Overview

The UC2842AM is a Power Management IC (PMIC) designed for boost, buck, flyback, and forward regulator topologies with isolation-capable output configuration. This 8-DIP through-hole component functions as a transistor driver for step-up and step-down DC-DC conversion applications. The UC2842AM is discontinued at DiGi Electronics, necessitating equivalent alternatives for new designs and production continuity. Active substitute parts with compatible electrical and mechanical specifications ensure uninterrupted supply chain access.

Key Parameters

Parameter	UC2842AM
Manufacturer	Microchip Technology
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Voltage - Supply (Vcc/Vdd)	10V ~ 30V
Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	96%
Operating Temperature	-40°C ~ 85°C
Output Type	Transistor Driver
Function	Step-Up, Step-Down
Output Configuration	Positive, Isolation Capable
Topology	Boost, Buck, Flyback, Forward
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Equivalent and substitute parts for the UC2842AM are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Package Compatibility: All substitutes maintain 8-DIP through-hole form factor (0.300", 7.62mm)
Voltage Supply Range: Supply voltage specification of 10V ~ 30V or compatible lower range (7.6V ~ 30V)
Switching Frequency: Up to 500kHz capability
Duty Cycle: Maximum 96% duty cycle support
Operating Temperature: -40°C ~ 85°C or compatible range (0°C ~ 70°C or -25°C ~ 85°C)
Output Configuration: Positive output with isolation capability preference
Topology Support: Boost, Buck, Flyback, Forward capabilities
Control Features: Frequency control functionality

Parts are classified as Direct Substitutes when all electrical and mechanical parameters align with UC2842AM specifications. Parts designated as Similar may have minor parameter variations (temperature range, minimum supply voltage) but retain functional equivalence within typical application operating windows.

Parameter Comparison

Part Number	Manufacturer	Package	Vcc/Vdd Range	Switching Freq	Duty Cycle Max	Operating Temp	Status	RoHS
UC2842AM	Microchip Technology	8-DIP	10V ~ 30V	Up to 500kHz	96%	-40°C ~ 85°C	Discontinued	ROHS3
UC2842AN	onsemi	8-DIP	10V ~ 30V	Up to 500kHz	96%	-25°C ~ 85°C	Obsolete	Non-compliant
UC2842N	Texas Instruments	8-DIP	12V ~ 28V	Up to 500kHz	96%	-40°C ~ 85°C	Active	ROHS3
UC2843N	Texas Instruments	8-DIP	12V ~ 28V	Up to 500kHz	96%	-40°C ~ 85°C	Active	ROHS3
TL2842BP	Texas Instruments	8-DIP	10V ~ 30V	Up to 500kHz	96%	-40°C ~ 85°C	Active	ROHS3
TL3842BP	Texas Instruments	8-DIP	10V ~ 30V	Up to 500kHz	96%	0°C ~ 70°C	Last Time Buy	ROHS3
TL3843BP	Texas Instruments	8-DIP	7.6V ~ 30V	Up to 500kHz	96%	0°C ~ 70°C	Active	ROHS3
UC2842BN	STMicroelectronics	8-DIP	10V ~ 30V	Up to 500kHz	96%	-25°C ~ 85°C	Active	ROHS3
UC2843BN	STMicroelectronics	8-DIP	7.6V ~ 30V	Up to 500kHz	96%	-25°C ~ 85°C	Active	ROHS3
UC2843BNG	onsemi	8-DIP	7.6V ~ 30V	Up to 500kHz	96%	-25°C ~ 85°C	Active	ROHS3
UC3842AN	onsemi	8-DIP	10V ~ 30V	Up to 500kHz	96%	0°C ~ 70°C	Obsolete	Non-compliant

Engineering Selection Recommendations

First-Choice Alternatives are active production parts with ROHS3 compliance:

TL2842BP (Texas Instruments): Identical electrical specifications to UC2842AM with extended temperature range matching the original part (-40°C ~ 85°C) and active product status. Full voltage supply range 10V ~ 30V ensures direct pin-compatible replacement.
UC2842BN (STMicroelectronics): Active ROHS3-compliant part with matching voltage supply and switching specifications. Supports boost and flyback topologies with isolation capability. Reduced temperature range (-25°C ~ 85°C) is suitable for industrial applications outside extreme cold environments.

Secondary Options provide expanded topology support:

TL3843BP (Texas Instruments): Active production part with ROHS3 compliance. Extended boost, flyback, and forward topology support. Reduced minimum supply voltage (7.6V ~ 30V) permits lower input voltage applications. Operating temperature restricted to 0°C ~ 70°C.
UC2843BNG (onsemi): Active ROHS3-compliant part supporting boost and flyback topologies. Reduced minimum supply voltage (7.6V ~ 30V). Temperature range -25°C ~ 85°C.

Obsolete alternatives (UC2842AN, UC3842AN) should not be selected for new designs due to discontinued product status and non-compliant RoHS certification.

Frequently Asked Questions (FAQ)

Q: Can UC2842N and UC2843N from Texas Instruments directly replace UC2842AM?

A: UC2842N and UC2843N are functionally compatible regarding switching frequency (500kHz), duty cycle (96%), and package (8-DIP). However, the specified voltage supply range is 12V ~ 28V compared to UC2842AM's 10V ~ 30V, restricting operation at lower input voltages (10V-12V) and higher voltages (28V-30V). These parts are suitable only when system supply voltage remains within 12V ~ 28V bounds.

Q: Is the UC2842BN suitable for applications requiring -40°C operation?

A: UC2842BN operates within -25°C ~ 85°C temperature range. Applications requiring -40°C minimum operation must use UC2842AM specifications or TL2842BP (both rated -40°C ~ 85°C). Verify actual application temperature requirements before selection.

Q: What is the difference between UC2843 and UC2842 part series?

A: Both UC2842 and UC2843 controller ICs support identical switching frequency (500kHz), duty cycle (96%), and 8-DIP packaging. UC2843 variants may support reduced minimum supply voltage (7.6V vs. 10V for UC2842), enabling lower input voltage applications. Refer to specific part datasheets for topology and control feature variations.

Q: Do all 8-DIP substitutes have identical pinout compatibility?

A: All listed substitute parts maintain 8-DIP (0.300", 7.62mm) through-hole form factor and are pinout-compatible for PCB socket and through-hole mounting applications. However, verify pinout assignments in manufacturer datasheets before soldering replacements to ensure correct signal routing.

Q: Which substitute is recommended for new PCB designs?

A: TL2842BP is the recommended choice for new designs, combining active production status, ROHS3 compliance, identical electrical specifications to UC2842AM, and full temperature range support (-40°C ~ 85°C). This selection ensures supply chain continuity and regulatory compliance without design modification.

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